Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb6787f10ced31…

MALICIOUS

PDF

39.0 KB Created: 2020-04-11 04:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 3c102b7ad3eead3c06ef9c8d262bacb2 SHA-1: eacd704ca63ed3f6720bc78b908366ecf00fe632 SHA-256: 91fb6787f10ced31a559d2e889ff1243fa2eaf39c3a199fa9dcffc9b870f8fb1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files with numeric slugs. The document body text, while partially corrupted, includes a reference to 'As vantagens de ser invisivel legendado' and the wkhtmltopdf authoring application, suggesting a lure. The primary heuristic indicates a 'PDF_SEO_LINK_FARM' which is a common technique for distributing malicious content or conducting phishing by overwhelming search engines with links. The embedded URLs are likely part of this link farm, aiming to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/8/130814032/130814032.html#as+vantagens+de+ser+invisivel+legendado PDF link annotation
    • http://neelixconsulting.com/uploads/1/3/0/5/130543418/wepawuloxaxogu_ferixesudadef_penisovaxusa_biketatokimoze.pdfIn PDF document text
    • http://chronmusic.com/uploads/1/3/0/6/130604589/wafekolezumuti_fovafivus.pdfIn PDF document text
    • http://agnesmovie.com/uploads/1/3/0/9/130969644/46b425c1.pdfIn PDF document text
    • http://ndchair.com/uploads/1/3/0/6/130605216/senugodududu.pdfIn PDF document text
    • http://parkingcomplianceservicesllc.com/uploads/1/3/1/3/131398066/tototoduz_mojuzixoju.pdfIn PDF document text
    • http://guatemalamayanguide.com/uploads/1/3/0/2/130273752/2a624a3b56aa.pdfIn PDF document text
    • http://iamdaniellestevens.com/uploads/1/3/0/6/130639363/918e384.pdfIn PDF document text
    • http://eimearreynolds.com/uploads/1/3/1/4/131414561/c62fe7aefd6.pdfIn PDF document text
    • http://hawaiimartialartsgroup.com/uploads/1/3/0/6/130620573/0c158a3244.pdfIn PDF document text
    • http://merakiimeasure.com/uploads/1/3/0/6/130605115/31b11.pdfIn PDF document text
    • http://villagesbest.info/uploads/1/3/0/4/130488631/761468.pdfIn PDF document text
    • http://mta-sts.mx.pushelitefitness.com/uploads/1/3/0/6/130639411/d3e91.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5691 10132 bytes
SHA-256: 83b00d7ee5c8e1cdc0b144c64ab436962d12d9678a882a32961d137cc3a5aeb1
font_01_sfnt_off000078d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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